Jewishdata.com is
a commercial website which
has digitized photos of grave from a number of cemeteries.
Currently, there are about 135,000 headstone images from Chicago
area Jewish cemeteries.
Chicago area:

We have also compiled an
alphabetical list of all organizations and Congregations which
have sections at one of the Jewish cemeteries in Chicagoland. By
accessing this list you can determine which cemetery has the
section you are interested in finding. This list can be found
at:

Three
funeral home companies exist today which have historical records. Their records may include address of
deceased, next of kin including address, phone number, burial plot location,
Social Security number of the deceased, clergy, ... Piser
Chapels: records from 1900 holding files of former Original Weinsteins, Hartman-Miller,
Gratch-Mandel, Albert & Jaffe, and J. (Jacob) Weinstein.